The Moth-Flies 



being carried down the stream. They were found on the stones 

 of the stream bed, not usually submerged, but always at the very 

 verge of the water, sometimes submerged, sometimes above the 

 water surface, but always wetted by the current or spray. They 

 look something like a sow-bug or pill-bug (Oniscus) in shape, but 

 are narrower. Kellogg's figures and descriptions may be found 

 in Entomological News for February, 1901. 



Less than twenty species have been described in the United 

 States. 



109 



